﻿    <p>
      An <em>IfcCurve</em> is a curve in two-dimensional or
      three-dimensional space. It includes definitions for
      bounded and unbounded curves.
    </p>
    <blockquote class="note">NOTE&nbsp;  Definition according to
        ISO 10303-42:<br>
        A curve can be envisioned as the path of a point moving in
        its coordinate space.</blockquote>
    <blockquote class="note">NOTE
        Entity adapted from <strong>curve</strong> defined in
        ISO 10303-42</blockquote>
<blockquote class="history">HISTORY&nbsp; New
        entity in IFC1.0</blockquote>
    <p class="spec-head">Informal Propositions:</p>
    <ol>
      <li>A curve shall be arcwise connected
      </li>
      <li>A curve shall have an arc length greater than zero.
      </li>
    </ol>